Is there ever going to be a reason to level mastery?

So like the title says is there ever going to be a reason to get mastery 6 or 7 like access to exclusive cromas or skins or maybe you get emoji of the champ or is it always going to be the LV 6/7 emote. Asking because I want to decide if I should try to lv up my lv 5 and 6 champs or if I should lv up all my other champs to 5 first
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